The STDs that can be cured are Chlamydia, Gonorrhea, Syphilis, Bacterial Vaginosis, Trichomoniasis, Zika Virus and most recently Hepatitis C virus. Within the past decade a medication was introduced that has been able to create a "sustained virologic response (SVR): you are considered cured if the Hepatitis C virus is not detected when measured with a blood test three months after you've completed treatment" (Treating Hepatitis C, 2017). STDs that can only be treated are HIV/AIDS, Hepatitis B, HPV and Genital Herpes. With the uncurable but treatable STDs, there is always the risk of being contagious even if the person with the STD does not appear to have any symptoms of the STD at the time of sexual activity and relations.
The most effective method to prevent the spread of STDs is to abstain from sexual activity. If abstinence is not part of a person's lifestyle, getting tested regularly for STDs and using condoms is the second-best preventative measure to avoid contracting an STD or spreading one to a partner if a person is infected.
If a person is diagnosed with an STD they should seek the appropriate treatment, notify the local health department of the diagnosis (if the diagnosing physician has not done so already) and notify any sexual partners that may have been exposed to the STD through sexual contact with the infected person. A person should also take preventative measures such as abstaining from sexual activity or only having protected sex with condoms to avoid the risk of infecting anyone else with the diagnosed STD.
STDs, also known as sexually transmitted diseases, are contracted mostly from anal, sexual or oral sex. You can also contract something by sharing items such as clothes, toothbrushes, razors, needles, etc. There are various diseases such as HIV, gonorrhea, genital warts, trichomoniasis, genital herpes, syphilis, etc. HIV and herpes can't be cured but it can be managed. Other STDs such as chlamydia, syphilis, gonorrhea, pubic lice/"crabs", Trichomoniasis can be cured. The most effective ways to avoid contracting STDs is abstinence, going to the doctor for regular check ups, having one partner that you trust that don't have multiple partners. You should immediate go to a health care provider if you're diagnosed with STD in order to be treated properly.